The phenomenon which Ishall discuss occurs as a normal reaction. It also occurs in a modified way in pathologic conditions of the spinal cord and possibly also in conditions of the cerebral tissue.
The phenomenon is elicited by having the patient in a sitting position with the spine curved fforward.s are separated from each other about 6 inches 65.24 cm.). The cm.).laced so as to rest on the floor at right angles to the thighs. The arms are dropped relaxed on either side of the legs.
The spine is not percussed directly with the percussion hammer. The index finger is placed firmly against the spine, in the median line, and a sharp blow is made against the finger.
In the normal person, if each successive segment of the spine is so percussed, at the level of the first lumbar spine and extending through the lumbar area, a sharp contraction of
McCARTHY DJ. THE SPINO-ADDUCTOR REFLEXSPINOMUSCULAR PHENOMENON IN THE DISTRIBUTION OF THE LUMBAR SEGMENT AND THE ADDUCTORS OF THE THIGHS: A PRELIMINARY NOTE. Arch NeurPsych. 1929;21(6):1318-1320. doi:10.1001/archneurpsyc.1929.02210240093006